NASA Wraps its 1st Undersea Expedition in Two Years

Four astronauts resurfaced July 29 from an undersea laboratory where they had spent the past nine days honing space exploration skills while learning to live in close quarters. The expedition marked the first time in two years that NASA has sent astronauts to the Aquarius Reef Base research station, a pressurized habitat 19 meters beneath the Atlantic Ocean near Key Largo, Florida.